JP2019203449A - Intake manifold - Google Patents

Abstract

To provide an intake manifold which can reduce variation of pressure losses of air intakes flowing through a plurality of branch pipes and suppress increasing of a pressure loss in an air intake introduction port.SOLUTION: An intake manifold 1 includes an air intake introduction port 3, a surge tank 4,and a plurality of branch pipes 5a-5d. In addition, the surge tank includes a tank inner space 4a extending in a direction in which the branch pipes are placed side by side. The air intake introduction port is provided in a one end side of the tank inner space of the surge tank in the extension direction P, and includes a curved part 3a curved with respect to the extension direction of the tank inner space. Furthermore, in an inner side of the air intake introduction port, a flow adjusting plate 11 for swirling intake air around an axis C of the air intake introduction port. The swirling of the intake air by the flow adjusting plate directs the intake air flowing in an inner side of the curved part toward an outer side and the intake air flowing in the outer side of the curved part toward the inner side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an intake manifold, and more particularly to an intake manifold that distributes intake air supplied to a surge tank from an intake inlet to a plurality of branch pipes and supplies the intake manifold to each intake port of an engine.

  As a conventional intake manifold, one that distributes intake air supplied to a surge tank from an intake inlet to a plurality of branch pipes and supplies the intake manifold to each intake port of the engine is generally known (for example, Patent Documents 1 and 2). reference). These Patent Documents 1 and 2 describe that an intake inlet is provided on one end side in the extending direction of the surge tank.

JP 2017-150426 A JP-A-11-350963

  Here, as the intake manifold 101, for example, as shown in FIG. 6A, an intake inlet 103 having a curved portion 103a curved with respect to the extending direction P of the surge tank 104 is often employed. In this case, intake air is likely to enter the near-side branch pipes 105 a and 105 b close to the intake introduction port 103, and intake air is difficult to enter the far-side branch pipes 105 c and 105 d far from the intake introduction port 103. Therefore, there is a large variation in the pressure loss of each intake air flowing through the plurality of branch pipes 105a to 105d.

  Therefore, as an intake manifold 201 that solves the above problem, for example, as shown in FIG. 6B, the intake air flowing inside the curved portion 203a inside the intake inlet 203 is fed to the inner branch pipes 205c and 205d. A technique for setting the rectifying plate 211 to be guided has been proposed. However, in this proposed technique, the intake air flowing inside the curved portion 203a of the intake inlet 203 passes through a very small path of the bending R (bending radius), so that pressure loss occurs at the portion P1 inside the curved portion 203a. As a result, a rise in performance will occur and performance will be degraded.

  Note that Patent Document 1 describes an engine intake device that includes a swirl flow forming portion that forms a swirl flow in a space in a surge tank. However, the swirling flow is formed by forming the shape of the surge tank, not the rectifying plate, by making the cross section of the other end in the extending direction smaller than the upstream entrance. Further, Patent Document 2 describes an intake manifold in which an inflow angle adjusting convex portion is provided in the vicinity 1 upstream of the farthest intake outlet.

  The present invention has been made in view of the above situation, and provides an intake manifold that can reduce variations in pressure loss of each intake air flowing through a plurality of branch pipes and can suppress an increase in pressure loss at the intake inlet. For the purpose.

In order to solve the above problem, the invention according to claim 1 is directed to an intake air inlet into which intake air is introduced, a surge tank to which intake air is supplied from the intake air inlet, a branch from the surge tank, and an engine A plurality of branch pipes for supplying intake air to each of the intake ports, wherein the surge tank includes a tank internal space extending in a direction in which the plurality of branch pipes are arranged, The introduction port is provided at one end side of the surge tank in the extending direction of the space in the tank, and includes a curved portion that is curved with respect to the extending direction of the space in the tank. Is provided with a rectifying plate that turns the intake air around its axis, and the rectifying plate turns the intake air inside the intake inlet, thereby directing the intake air flowing inside the curved portion to the outside. One said flowing outside of the curved section and summarized in that directing the air to the inside.
According to a second aspect of the present invention, in the first aspect of the present invention, the rectifying plate is formed in a plate shape twisted around an axis of the intake inlet, and two inner sides of the intake inlet are provided. The gist is that it is provided so as to be partitioned into spaces.
Invention of Claim 3 makes it a summary to the invention of Claim 1 or 2 that the notch part which can pass inhalation is formed in the both sides of the upstream edge part of the said baffle plate. .
The gist of the invention according to claim 4 is that, in the invention according to any one of claims 1 to 3, the downstream end portion of the rectifying plate extends into the surge tank.

According to the intake manifold of the present invention, the surge tank includes a tank inner space extending in a direction in which a plurality of branch pipes are arranged, and the intake inlet is on one end side in the extending direction of the tank inner space of the surge tank. A curved portion that is provided and curved with respect to the extending direction of the space in the tank is provided. A rectifying plate that swirls the intake air around its axis is provided inside the intake inlet, and the rectifying plate swirls the intake air inside the intake inlet, so that the intake air flowing inside the curved portion is outside. And the intake air flowing outside the curved portion is directed inward. As a result, the intake air supplied from the intake inlet into the surge tank is supplied in a well-balanced manner along the extending direction of the space in the tank by the rectifying plate and is distributed substantially evenly to the branch pipes. Therefore, variation in pressure loss of each intake air flowing through the plurality of branch pipes is suppressed. Furthermore, since the intake air swirled in the intake inlet by the rectifying plate passes through a path having a relatively large bend R (bending radius), an increase in pressure loss at the intake inlet is suppressed.
Further, when the rectifying plate is formed in a plate shape twisted around the axis of the intake inlet, and provided so as to partition the inside of the intake inlet into two spaces, The intake air is effectively turned.
In addition, in the case where a cut portion through which intake air can pass is formed on both sides of the upstream end portion of the rectifying plate, the intake air is effectively swirled by the rectifying plate by passing the intake air through the cut portion. The
Further, when the downstream end of the current plate extends into the surge tank, intake air is supplied in a more balanced manner along the extending direction of the space in the tank.

The present invention will be further described in the following detailed description with reference to the referenced drawings, given by way of non-limiting examples of exemplary embodiments according to the present invention. Similar parts are shown throughout the several figures.
It is a front view of the intake manifold which concerns on an Example. It is II arrow directional view of FIG. It is a III arrow directional view of FIG. It is a front view of the baffle plate which concerns on an Example. It is a graph which shows the result of the pressure loss test of the intake manifold which concerns on an experiment example and a comparative example. It is explanatory drawing for demonstrating the conventional intake manifold, (a) shows the form which is not provided with a baffle plate, (b) shows the form provided with a baffle plate.

  The items shown here are exemplary and illustrative of the embodiments of the present invention, and are the most effective and easy-to-understand explanations of the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to illustrate the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention. It will be clear to those skilled in the art how it is actually implemented.

  The intake manifold according to the present embodiment includes an intake air inlet (3) through which intake air is introduced, a surge tank (4) to which intake air is supplied from the intake air inlet, and a branch from the surge tank. It is an intake manifold (1) provided with several branch pipes (5a-5d) which supply intake air to each intake port (2a) (for example, refer FIGS. 1-3). The surge tank (4) includes a tank inner space (4a) extending in a direction in which the plurality of branch pipes (5a to 5d) are arranged, and the intake inlet (3) is a tank inner space of the surge tank. And a curved portion (3a) that is curved with respect to the extending direction (P) of the space in the tank. Further, a rectifying plate (11) for turning the intake air around its axis (C) is provided inside the intake introducing port (3), and the rectifying plate (11) is disposed in the intake introducing port (3). By turning the intake air, the intake air flowing inside the curved portion (3a) is directed outward and the intake air flowing outside the curved portion (3a) is directed inward.

  As the intake manifold according to the present embodiment, for example, the rectifying plate (11) is formed in a plate shape twisted around the axis (C) of the intake inlet (3) and the intake inlet (3). The form (refer FIG. 1-3 etc., for example) provided so that the inner side of this may be divided into two spaces is mentioned.

  As an intake manifold according to the present embodiment, for example, on both sides of the upstream end portion (11a) of the rectifying plate (11), a cut portion (12) through which intake air can pass is formed (for example, For example). Examples of the depth (d) of the cut portion include 15 to 30 mm (preferably 20 to 25 mm). Furthermore, as a width | variety (w) of a notch part, 5-20 mm (preferably 10-15 mm) is mentioned, for example.

  As the intake manifold according to the present embodiment, for example, the downstream end (11b) of the rectifying plate (11) extends into the surge tank (4) (see, for example, FIG. 1).

  In addition, the code | symbol in the parenthesis of each structure described in the said embodiment shows the correspondence with the specific structure as described in the Example mentioned later.

  Hereinafter, the present invention will be specifically described with reference to the drawings. In the present embodiment, as an “intake manifold” according to the present invention, a resin intake manifold used for an in-line four-cylinder engine is illustrated.

(1) Configuration of Intake Manifold As shown in FIGS. 1 to 3, the intake manifold 1 according to this embodiment includes an intake inlet 3 through which intake air is introduced and a surge tank to which intake air is supplied from the intake inlet 3. 4 and four branch pipes 5 a to 5 d that branch from the surge tank 4 and supply intake air to the intake ports 2 a of the engine 2.

  Each of the branch pipes 5 a to 5 d extends in a spiral shape so as to surround the surge tank 4. The surge tank 4 includes a tank internal space 4a extending in the direction in which the four branch pipes 5a to 5d are arranged. The intake inlet 3 is formed in a tubular shape that forms an intake passage. The intake inlet 3 is provided on one end side in the extending direction P of the tank space 4 a of the surge tank 4. The intake inlet 3 includes a curved portion 3a that is curved with respect to the extending direction P of the tank internal space 4a. Therefore, the intake air inlet 3 supplies the intake air introduced from the direction intersecting the extending direction P of the tank inner space 4a into the surge tank 4 from the extending direction P of the tank inner space 4a.

  In this embodiment, as shown in FIG. 1 and FIG. 3, in the extending direction P of the tank inner space 4a, the part arranged in the region R1 is the intake inlet 3 and the part arranged in the region R2 is The surge tank 4 is used. Note that reference numeral 5 a ′ in the drawing indicates a connection end portion of the branch pipe 5 a with respect to the surge tank 4.

  A throttle body 8 having a throttle valve 7 that can open and close the intake path is provided upstream of the intake inlet 3. The throttle valve 7 is rotatably provided between the fully closed state and the fully opened state of the intake passage. In the drawing, the throttle valve 7 in a fully opened state is shown.

  Inside the intake inlet 3 is provided a rectifying plate 11 for turning the intake air around its axis C. The rectifying plate 11 turns the intake air inside the intake inlet 3 to direct the intake air flowing inside the curved portion 3a to the outside and to direct the intake air flowing outside the curved portion 3a to the inside.

  The rectifying plate 11 is formed in a plate shape twisted around the axis C of the intake inlet 3. The rectifying plate 11 is in contact with the inner wall of the intake inlet 3 on both sides. The rectifying plate 11 is provided so as to partition the inside of the intake inlet 3 into two spaces (specifically, two spaces twisted around the axis C of the intake inlet 3).

  As shown in FIG. 3, the upstream end portion 11 a of the rectifying plate 11 is formed in a straight line (specifically, a flat plate shape) so as to face the throttle valve 7 in the fully opened state. On both sides of the upstream end portion 11a of the current plate 11, cut portions 12 through which intake air can pass are formed (see FIG. 4). The notch 12 has a depth d of about 22 mm and a width w of about 12 mm. Further, the downstream end portion 11 b of the rectifying plate 11 extends into the surge tank 4.

  In this embodiment, an intake manifold 1 configured by combining and integrating a plurality of (for example, three or four) resin parts is employed. Then, the rectifying plate 11 is set with respect to the intake introducing port 3 by welding both side edges of the rectifying plate 11 between a pair of resin members which are welded to each other by vibration welding or the like to form the intake introducing port 3. And

(2) Action of Intake Manifold Next, the action of the intake manifold 1 having the above configuration will be described. According to this intake manifold 1, as shown in FIG. 1, when the engine is operating, intake air introduced from the throttle body 8 to the intake inlet 3 is supplied into the surge tank 4, and the intake air is supplied to the branch pipes 5a to 5d. This is distributed and supplied to each intake port 2 a of the engine 2. Then, the intake air supplied from the intake inlet 3 into the surge tank 4 is supplied approximately evenly over the extending direction P of the tank internal space 4 a by the rectifying plate 11.

  In addition, as shown in FIGS. 1 to 3, the intake air flowing through the intake inlet 3 is swung by the rectifying plate 11 so that the intake air flowing inside the curved portion 3a flows outward (in the drawing). Indicated by the arrow A.), the intake air flowing outside the curved portion 3a flows inward (indicated by the arrow B in the figure). The intake air flows A and B swirled by the current plate 11 pass through a relatively large path of bending R (bending radius). Furthermore, as shown in FIG. 4, the intake air passes through the cut portion 12 of the upstream end portion 11 a of the rectifying plate 11, thereby improving the swirlability of the intake air by the rectifying plate 11.

(3) Effects of the Embodiment According to the intake manifold 1 of the present embodiment, the surge tank 4 includes the tank inner space 4a extending in the direction in which the four branch pipes 5a to 5d are arranged, and the intake inlet 3 Is provided on one end side in the extending direction P of the tank internal space 4a of the surge tank 4 and includes a curved portion 3a curved with respect to the extending direction P of the tank internal space 4a. A rectifying plate 11 for turning the intake air around its axis C is provided inside the intake introduction port 3, and the rectifying plate 11 turns the intake air inside the intake introduction port 3, thereby bending the curved portion 3 a. The intake air flowing inside is directed outward and the intake air flowing outside the curved portion 3a is directed inward. As a result, the intake air supplied from the intake inlet 3 into the surge tank 4 is supplied in a well-balanced manner along the extending direction P of the tank internal space 4a by the rectifying plate 11, and is distributed substantially evenly to the branch pipes 5a to 5d. The Therefore, variation in the pressure loss of each intake air flowing through the four branch pipes 5a to 5d is suppressed. Furthermore, since the intake air swirled in the intake air inlet 3 by the rectifying plate 11 passes through a relatively large path of bending R (bending radius), an increase in pressure loss at the intake air inlet 3 is suppressed. .

  Further, in this embodiment, the rectifying plate 11 is formed in a plate shape twisted around the axis C of the intake inlet 3 and is provided so as to partition the inside of the intake inlet 3 into two spaces. . Thereby, the intake air is effectively swirled by the rectifying plate 11.

  Further, in this embodiment, cut portions 12 through which intake air can pass are formed on both sides of the upstream end portion 11a of the current plate 11. Thus, the intake air is effectively swirled by the rectifying plate 11 as the intake air passes through the cut portion 12.

  Further, in the present embodiment, the downstream end portion 11 b of the rectifying plate 11 extends into the surge tank 4. As a result, the intake air is supplied in a more balanced manner over the extending direction P of the tank internal space 4a.

(4) Experimental Example and Comparative Example Here, the pressure loss test of the intake manifold according to the experimental example and the comparative example will be described. In this pressure loss test, an intake manifold 1 (see FIG. 1) having a rectifying plate 11 was employed as an experimental example, and an intake manifold 101 (see FIG. 6 (a)) without a rectifying plate was employed as a comparative example. . And the pressure loss of each branch pipe 5a-5d of each intake manifold 1 and 101 of an experiment example and a comparative example and 105a-105d was measured.

  As a result, as shown in FIG. 5, in the intake manifold 1 of the experimental example, the average pressure loss of the intake air flowing through the four branch pipes 5a to 5d is about 2.44 kPa, and the four branch pipes 5a to 5d are The variation in pressure loss of the flowing intake air was about 1.0%. On the other hand, in the intake manifold 101 of the comparative example, the average pressure loss of the intake air flowing through the four branch pipes 105a to 105d is about 2.63 kPa, and the pressure loss of the intake air flowing through the four branch pipes 105a to 105d The variation was about 10.08%. As described above, according to the intake manifold 1 of the experimental example, the overall pressure loss is reduced as compared with the intake manifold 101 of the comparative example, and variations in the pressure loss flowing through the branch pipes 5a to 5d are suppressed. confirmed.

  In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the said Example, although the current plate 11 set by welding simultaneously with the welding of the resin member which comprises the intake manifold 1 was illustrated, it is not limited to this, For example, as the current plate 11 assembled later, Good.

  Moreover, in the said Example, although the rectifying plate 11 which partitioned off the inner side of the intake inlet 3 into two spaces in the state which the side edge contact | connected the inner wall of the intake inlet 3 was not limited to this, For example, a side It is good also as the baffle plate 11 which partitions off the inner side of the intake inlet 3 into two spaces in the state which the side | part was spaced apart from the inner wall of the intake inlet 3.

  Moreover, in the said Example, although the baffle plate 11 provided with the notch part 12 was illustrated, it is not limited to this, For example, it is good also as the baffle plate 11 which is not provided with the cut part 12. FIG.

  Moreover, in the said Example, although the rectifying plate 11 in which the downstream end part 11b extended to the inside of the surge tank 4 was illustrated, it is not limited to this, For example, the downstream end part 11b does not extend into the surge tank 4, The current plate 11 may be set only in the mouth 3.

  Furthermore, in the said Example, although the intake manifold 1 used for the in-line 4-cylinder engine 2 was illustrated, it is not limited to this, For example, it is good also as an intake manifold 1 used for multi-cylinder engines other than 4 cylinders. In this case, the number of branch pipes corresponding to the number of cylinders is employed. Further, for example, the intake manifold 1 may be used for a V-type engine or a horizontally opposed engine other than those in series.

  Furthermore, although the resin-made intake manifold 1 was illustrated in the said Example, it is not limited to this, For example, it is good also as a metal-made intake manifold 1. FIG.

  The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is to be understood that the language used in the description and illustration of the invention is illustrative and exemplary rather than limiting. As detailed herein, changes may be made in its form within the scope of the appended claims without departing from the scope or spirit of the invention. Although specific structures, materials and examples have been referred to in the detailed description of the invention herein, it is not intended to limit the invention to the disclosure herein, but rather, the invention is claimed. It covers all functionally equivalent structures, methods and uses within the scope.

  The present invention is not limited to the embodiments described in detail above, and various modifications or changes can be made within the scope of the claims of the present invention.

  It is widely used as a technology related to an intake manifold that supplies intake air to each intake port of an engine used in passenger cars, buses, trucks, and other vehicles.

  DESCRIPTION OF SYMBOLS 1; Intake manifold, 2; Engine, 2a; Intake port, 3; Intake inlet, 3a; Curved part, 4; Surge tank, 4a; In-tank space, 5a-5d; Branch pipe, 7: Throttle valve, 11; Current plate, 11a; upstream end portion, 11b; downstream end portion, 12; cut portion, C: axis of intake inlet port, P: extending direction of space in tank.

Claims (4)

An intake inlet through which intake air is introduced; a surge tank to which intake air is supplied from the intake inlet; and a plurality of branch pipes that branch from the surge tank and supply intake air to each intake port of the engine An intake manifold,
The surge tank includes a tank internal space extending in a direction in which the plurality of branch pipes are arranged,
The intake inlet is provided on one end side in the extending direction of the space in the tank of the surge tank, and includes a curved portion curved with respect to the extending direction of the space in the tank,
Inside the intake inlet, a rectifying plate for turning the intake air around its axis is provided,
The rectifying plate is configured to cause intake air flowing inside the curved portion to be directed outward and intake air flowing to the outside of the curved portion to be directed inward by swirling intake air in the intake inlet. Manifold.   2. The intake manifold according to claim 1, wherein the rectifying plate is formed in a plate shape twisted around an axis of the intake inlet and is provided so as to partition the inside of the intake inlet into two spaces.   The intake manifold according to claim 1 or 2, wherein a cut portion through which intake air can pass is formed on both sides of the upstream end portion of the rectifying plate.   The intake manifold according to any one of claims 1 to 3, wherein a downstream end portion of the rectifying plate extends into the surge tank.

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